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<title>Faint Object Spectrograph</title>

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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">Faint Object Spectrograph</span></span>

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<p>The <b>Faint Object Spectrograph</b> (FOS) was a <a href="Spectrograph" class="mw-redirect" title="Spectrograph">spectrograph</a> installed on the <a href="Hubble_Space_Telescope" title="Hubble Space Telescope">Hubble Space Telescope</a>. It was replaced by the <a href="Space_Telescope_Imaging_Spectrograph" title="Space Telescope Imaging Spectrograph">Space Telescope Imaging Spectrograph</a> in 1997, and is now on display in the <a href="National_Air_and_Space_Museum" title="National Air and Space Museum">National Air and Space Museum</a> in Washington DC.

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<div class="mw-heading mw-heading2"><h2 id="FOS_facts">FOS facts</h2></div>

<ul><li><b>Instrument type</b>: Spectrograph</li>

<li><b>Wavelength range</b>: 115 to 850 nm</li></ul>

<p>A technical description of the construction and operation of the FOS can be found in NASA technical report CP-2244.<sup id="cite_ref-CP-2244_1-0" class="reference"><a href="#cite_note-CP-2244-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> The instrument used two <a href="Digicon" title="Digicon">digicon</a> detectors, 'blue' and 'red', and had a spectral resolution of about 1300 over the 115 nm to 850 nm range. It had a number of apertures of varying size, but the aberration of the HST mirror meant that, until COSTAR was installed, the smallest apertures suffered very serious loss of light; even the largest 4.3-arcsecond aperture collected only 70% of the light from a point source.

</p><p>The digicons suffered from inadequate magnetic shielding, which meant that a static image was smeared over several pixels; the red digicon suffered most from this. Also, either the blue detector or one of the mirrors in the system was contaminated in such a way as to remove sensitivity below 150 nm; this was a serious problem since it makes the <a href="Lyman-alpha" title="Lyman-alpha">Lyman-alpha</a> line at 121.6 nm inaccessible.

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<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>

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</style><cite class="citation techreport cs1"><a rel="nofollow" class="external text" href="http://hdl.handle.net/2060/19820025420"><i>The Space Telescope Observatory</i></a> (Technical report). NASA. 1982. CP-2244.</cite>, page 55. A 40 MB PDF file.</span>

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<div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2></div>

<ul><li><span class="noviewer" typeof="mw:File"></span> Media related to <a href="https://commons.wikimedia.org/wiki/Category:Faint_Object_Spectrograph" class="extiw external" title="commons:Category:Faint Object Spectrograph">Faint Object Spectrograph</a> at Wikimedia Commons</li>

<li><a rel="nofollow" class="external text" href="https://archive.today/20121214233815/http://www.stsci.edu/hst/fos">The Faint Object Spectrograph (FOS)</a></li>

<li><a rel="nofollow" class="external text" href="http://www.spacetelescope.org/news/html/heic0112.html">ESA/Hubble Release about FOS</a></li>

<li><a rel="nofollow" class="external text" href="http://www.spacetelescope.org/about/general/instruments/fos.html">FOS at ESA/Hubble</a></li></ul>

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</style><div id="Hubble_Space_Telescope391" style="font-size:114%;margin:0 4em"><a href="Hubble_Space_Telescope" title="Hubble Space Telescope">Hubble Space Telescope</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%">Current instruments</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Advanced_Camera_for_Surveys" title="Advanced Camera for Surveys">Advanced Camera for Surveys (ACS)</a></li>

<li><a href="Cosmic_Origins_Spectrograph" title="Cosmic Origins Spectrograph">Cosmic Origins Spectrograph (COS)</a></li>

<li><a href="Fine_Guidance_Sensor_(HST)" title="Fine Guidance Sensor (HST)">Fine Guidance Sensor (FGS)</a></li>

<li><a href="Near_Infrared_Camera_and_Multi-Object_Spectrometer" title="Near Infrared Camera and Multi-Object Spectrometer">Near Infrared Camera and Multi-Object Spectrometer (NICMOS)</a></li>

<li><a href="Space_Telescope_Imaging_Spectrograph" title="Space Telescope Imaging Spectrograph">Space Telescope Imaging Spectrograph (STIS)</a></li>

<li><a href="Wide_Field_Camera_3" title="Wide Field Camera 3">Wide Field Camera 3 (WFC3)</a></li></ul>

</div></td><td class="noviewer navbox-image" rowspan="5" style="width:1px;padding:0 0 0 2px"><div><span typeof="mw:File"></span><br><span typeof="mw:File"></span></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Previous instruments</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Corrective_Optics_Space_Telescope_Axial_Replacement" title="Corrective Optics Space Telescope Axial Replacement">Corrective Optics Space Telescope Axial Replacement (COSTAR)</a></li>

<li><a href="Faint_Object_Camera" title="Faint Object Camera">Faint Object Camera (FOC)</a></li>

<li><a href="Goddard_High_Resolution_Spectrograph" title="Goddard High Resolution Spectrograph">Goddard High Resolution Spectrograph (GHRS/HRS)</a></li>

<li><a href="High_Speed_Photometer" title="High Speed Photometer">High Speed Photometer (HSP)</a></li>

<li><a href="Wide_Field_and_Planetary_Camera" title="Wide Field and Planetary Camera">Wide Field and Planetary Camera (WFPC)</a></li>

<li><a href="Wide_Field_and_Planetary_Camera_2" title="Wide Field and Planetary Camera 2">Wide Field and Planetary Camera 2 (WFPC2)</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Space_Shuttle" title="Space Shuttle">Space Shuttle</a> missions</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><i>Launch:</i> <a href="STS-31" title="STS-31">STS-31</a> <small>(1990, <a href="Space_Shuttle_Discovery" title="Space Shuttle Discovery"><i>Discovery</i></a>)</small></li>

<li><i>Servicing:</i> <a href="STS-61" title="STS-61">STS-61</a> <small>(1993, <a href="Space_Shuttle_Endeavour" title="Space Shuttle Endeavour"><i>Endeavour</i></a>)</small></li>

<li><a href="STS-82" title="STS-82">STS-82</a> <small>(1997, <i>Discovery</i>)</small></li>

<li><a href="STS-103" title="STS-103">STS-103</a> <small>(1999, <i>Discovery</i>)</small></li>

<li><a href="STS-109" title="STS-109">STS-109</a> <small>(2002, <a href="Space_Shuttle_Columbia" title="Space Shuttle Columbia"><i>Columbia</i></a>)</small></li>

<li><a href="STS-125" title="STS-125">STS-125</a> <small>(2009, <a href="Space_Shuttle_Atlantis" title="Space Shuttle Atlantis"><i>Atlantis</i></a>)</small></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Special fields<br>and images</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><i><a href="Pillars_of_Creation" title="Pillars of Creation">Pillars of Creation</a></i> <small>(1995)</small></li>

<li><a href="Hubble_Deep_Field" title="Hubble Deep Field">Hubble Deep Field</a> <small>(1995)</small></li>

<li><a href="Hubble_Deep_Field_South" title="Hubble Deep Field South">Hubble Deep Field South</a> <small>(1998)</small></li>

<li><a href="Hubble_Ultra-Deep_Field" title="Hubble Ultra-Deep Field">Hubble Ultra-Deep Field</a> <small>(2003–04)</small></li>

<li><a href="Extended_Groth_Strip" title="Extended Groth Strip">Extended Groth Strip</a> <small>(2004–05)</small></li>

<li><a href="Sagittarius_Window_Eclipsing_Extrasolar_Planet_Search" title="Sagittarius Window Eclipsing Extrasolar Planet Search">SWEEPS</a> <small>(2006)</small></li>

<li><i><a href="Mystic_Mountain" title="Mystic Mountain">Mystic Mountain</a></i> <small>(2010)</small></li>

<li><a href="Hubble_eXtreme_Deep_Field" class="mw-redirect" title="Hubble eXtreme Deep Field">Hubble eXtreme Deep Field</a> <small>(2012)</small></li>

<li><i><a href="Zooming_In_on_the_Andromeda_Galaxy" title="Zooming In on the Andromeda Galaxy">Zooming In on the Andromeda Galaxy</a></i> <small>(2015)</small></li>

<li><a href="Hubble_Legacy_Field" title="Hubble Legacy Field">Hubble Legacy Field</a> <small>(2019)</small></li>

<li><a href="Great_Observatories_Origins_Deep_Survey" title="Great Observatories Origins Deep Survey">Great Observatories Origins Deep Survey</a></li>

<li><a href="List_of_Hubble_Space_Telescope_anniversary_images" title="List of Hubble Space Telescope anniversary images">Anniversary images</a></li>

<li><a href="List_of_deep_fields" title="List of deep fields">List of deep fields</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Related</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Great_Observatories_program" title="Great Observatories program">Great Observatories program</a></li>

<li><a href="Space_Telescope_Science_Institute" title="Space Telescope Science Institute">Space Telescope Science Institute</a></li>

<li><a href="Goddard_Space_Flight_Center" title="Goddard Space Flight Center">Goddard Space Flight Center</a></li>

<li><a href="Edwin_Hubble" title="Edwin Hubble">Edwin Hubble</a></li>

<li><i><a href="Hubble_(film)" title="Hubble (film)">Hubble</a></i> (2010 documentary)</li>

<li><a href="Hubble_Origins_Probe" title="Hubble Origins Probe">Hubble Origins Probe</a></li></ul>

</div></td></tr><tr><td class="navbox-abovebelow" colspan="3"><div>

<ul><li><span class="noviewer" typeof="mw:File"><span title="Category"></span></span> <b>Category</b></li>

<li><span class="noviewer" typeof="mw:File"><span title="Commons page"></span></span> <a href="https://commons.wikimedia.org/wiki/Category:Hubble_Space_Telescope" class="extiw external" title="commons:Category:Hubble Space Telescope"><b>Commons</b></a></li></ul>

</div></td></tr></tbody></table></div>

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